The Toshiba D2499 is a high-voltage, high-current NPN bipolar junction transistor (BJT) built for demanding power electronics applications. With a collector-emitter voltage rating of up to 230V and a collector current rating of 15A, it handles large loads with ease.
Designed for audio power amplifier output stages, and TV horizontal stages, the 2SD2499 exhibits excellent gain characteristics and fast switching performance, making it equally suitable for voltage regulation and power conversion tasks.
It features a durable TO-3P package, enabling effective heat dissipation during high-power operation. Its silicon epitaxial planar construction ensures high reliability and consistent performance under varying electrical loads.
This transistor is widely used in replacement and upgrade scenarios for older audio systems and television sets and is compatible with several equivalent power BJTs.
Key Features of the D2499 Transistor
- NPN Power Transistor
- High collector-emitter voltage: 230V
- Collector current up to 15A
- Fast switching speed
- TO-3P package with enhanced thermal dissipation
- Ideal for audio amplifier output stages
D2499 Transistor Technical Specifications Table
| Parameter | Value |
| Transistor Type | NPN |
| V<sub>CEO</sub> (Max) | 230V |
| I<sub>C</sub> (Max) | 15A |
| V<sub>EB</sub> (Max) | 5V |
| P<sub>tot</sub> | 130W (approx.) |
| Package Type | TO-3P |
| h<sub>FE</sub> (Gain) | 55 – 160 (typical) |
| Transition Frequency (f<sub>T</sub>) | 30 MHz |
| Operating Temperature Range | –55°C to +150°C |
Applications of the D2499 Transistor
- Audio power amplifier stages
- Voltage regulators
- Power supply circuits
- Industrial motor drivers
- High-speed switching circuits
What’s in the Package and Recommended Usage Tips
- 1 × 2SD2499 NPN Power Transistor (Toshiba Original)
- Use a suitable heatsink with a thermal compound for optimal heat dissipation.
- Do not exceed voltage/current ratings; protect with fuses.
- For audio use, pair with its PNP complement (if applicable) for push-pull design.
- Follow the typical application circuit found in the datasheet for amplifier configurations.
D2499 Datasheet
Download 2SD2499 Datasheet – Toshiba
2sd2499 Pinout Diagram and Table
| Pin | Name | Description |
| 1 | Base (B) | Receives input signal |
| 2 | Collector (C) | Current flows through the load |
| 3 | Emitter (E) | Ground or return path |
(TO-3P standard package orientation)
Sample Circuit/Schematic Diagram
2sd2499 Equivalents or Variants
- 2SC5200
- MJL21194
- TIP3055 (lower-rated alternative)
- NTE36 (commercial replacement)
Why We Recommend It
The D2499 strikes a solid balance between performance and reliability. It’s trusted by engineers and DIYers alike for audio and power applications. With its high breakdown voltage and ample current handling, it’s a go-to transistor for robust circuits.
Customer Reviews
Lloyd – “Worked perfectly in my amplifier restoration project. Great quality!”
Jacinta – “Reliable and powerful transistor. Fast delivery by Dukatronic.”
Power Up Your Audio Builds Today!
Upgrade your amplifier or power circuit with the robust D2499 transistor. If you’re fixing a classic amp or building a new project, this transistor won’t let you down. Order now from Dukatronic and get fast shipping anywhere in Kenya!
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